package contest1606;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.PrintWriter;
import java.util.Scanner;

public class I {
    static Scanner cin = new Scanner(new BufferedInputStream(System.in));//大量输入优化版本
    static PrintWriter cout = new PrintWriter(new BufferedOutputStream(System.out));//大量输出优化版本
    static PrintWriter cerr = new PrintWriter(System.err, true);//开启调试模式,一般输出量不大，不需要buffered


    public static void main(String[] args) {
        //TODO AOJ开启你的ACM传奇人生
        cerr.println("----Start your ACM legendary life with AOJ(www.webturing.com)----");
        while (cin.hasNext()) {
            long n = cin.nextLong();
            cout.println(foo(n));
        }
        cin.close();//关闭输入流
        cout.close();//关闭输出流，这是必须的，否则一般不会自动刷新缓冲区
    }

    private static int foo(long n) {
        if (n == 1) return 0;
        if (n % 2 == 0) n /= 2;
        else n = 3 * n + 1;
        return foo(n) + 1;
    }
}

